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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period     $ 248,681,000  
Other comprehensive income (loss), net of tax $ 668,000 $ (741,000) 953,000 $ (1,254,000)
Amounts reclassified from accumulated other comprehensive loss, net of tax 0 0 0 0
Balance at end of period 274,096,000   274,096,000  
AOCI Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period (7,156,000) (5,365,000) (7,441,000) (4,852,000)
Balance at end of period (6,488,000) (6,106,000) (6,488,000) (6,106,000)
Unrealized Gain (Loss) on Short-Term Investments [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period 584,000 354,000 528,000 332,000
Other comprehensive income (loss), net of tax 60,000 66,000 116,000 88,000
Amounts reclassified from accumulated other comprehensive loss, net of tax 0 0 0 0
Balance at end of period 644,000 420,000 644,000 420,000
Foreign Currency Translation [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period (7,740,000) (5,719,000) (7,969,000) (5,184,000)
Other comprehensive income (loss), net of tax 608,000 (807,000) 837,000 (1,342,000)
Amounts reclassified from accumulated other comprehensive loss, net of tax 0 0 0 0
Balance at end of period $ (7,132,000) $ (6,526,000) $ (7,132,000) $ (6,526,000)